US3789873A - Pneumatic pressure transmitting device - Google Patents
Pneumatic pressure transmitting device Download PDFInfo
- Publication number
- US3789873A US3789873A US00187693A US3789873DA US3789873A US 3789873 A US3789873 A US 3789873A US 00187693 A US00187693 A US 00187693A US 3789873D A US3789873D A US 3789873DA US 3789873 A US3789873 A US 3789873A
- Authority
- US
- United States
- Prior art keywords
- cover
- chamber
- pneumatic pressure
- pressure
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B5/00—Transducers converting variations of physical quantities, e.g. expressed by variations in positions of members, into fluid-pressure variations or vice versa; Varying fluid pressure as a function of variations of a plurality of fluid pressures or variations of other quantities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
- F16K17/065—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure with differential piston
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2278—Pressure modulating relays or followers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/785—With retarder or dashpot
- Y10T137/7851—End of valve forms dashpot chamber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7837—Direct response valves [i.e., check valve type]
- Y10T137/785—With retarder or dashpot
- Y10T137/7852—End of valve moves inside dashpot chamber
Definitions
- a pneumatic pressure transmitting device for transmitting a pneumatic pressure which is in linear relation to a variable applied force of the kind comprising a pneumatic pressure chamber having an inlet duct with throttling means for admitting air under a pressure greater than that to be transmitted, and an outlet duct in communication with the inlet duct downstream of the throttling means, and a pneumatic pressure relief opening which is closed by a loose cover which engages a seating surrounding the opening, the cover being acted upon by a damper which clamps its movement off and on to the seating to prevent it from vibrating and also acted upon by a member by which the variable force is applied to it as a thrust along a line of action in alignment with the resultant of the pneumatic pressure in the chamber acting on the cover, so that when a force is applied to the member and air is supplied under pressure through the inlet duct, the pressure in the chamber increases until the cover is moved
- This invention relates to pneumatic pressure transmitting devices for transmitting a pneumatic pressure which is in linear relation to a variable applied force.
- One form of device for this purpose comprises a pneumatic pressure chamber having an inlet duct with throttling means for admitting air under a pressure greater than that to be transmitted, an outlet duct in communication with the inlet duct downstream of the throttling means and a pneumatic pressure relief opening which is closed by a loose cover which engages a seating surrounding the opening.
- the cover is acted upon by a damper which damps its movement off and on to the seating to prevent it from vibrating and it is also acted upon by a member by which the variable force is applied to it as a thrust along a line of action in alignment with the resultant of the pneumatic pressure in the chamber acting on the cover.
- the damper comprises a disc which is fixed to the cover and is located near the bottom of the chamber so that it is submerged in oil or other damping liquid contained in the chamber, and on movement of the cover, the disc is moved .in the liquid in a direction normal to its surface and thus produces a damping action.
- the aim of the present invention is to avoid this difficulty and construct the device in such a way that its period of operation before servicing of the damper becomes necessary is considerably increased.
- an opentopped receptacle for receiving oil or other damping liquid is provided outside the pneumatic pressurechamber and the damper comprises a plate which is supported near the bottom of the receptacle where, in use, it is submerged in the liquid, one part, that is either the receptacle or the plate, being rigid with the cover and the other part, that is the plate or the receptacle respectively, being rigid with the body containing the pneumatic pressure chamber.
- the receptacle may be an annular trough fixed around the outside of the chamber body, and in this case the damping plate is also annular and is rigidly connected to the cover by individual legs or a perforated skirt extending from the periphery of the cover.
- the cover necessarily has a part projecting radially outwards beyond the seating surrounding the pressure relief opening and air escaping through this opening from the chamber acts on this projecting part before being exhausted between the legs or through the perforated skirt and may slightly upset the relationship between the pressure in the chamber and the force applied to the cover.
- the receptacle preferably in the form of a cup, is provided on the face of the cover remote from the seating, and the plate is rigidly connected to the body containing the pneumatic pressure chamber.
- the plate is preferably annular, and the member by which the variable force is applied to the cover extends through the central opening of the annular plate into engagement with the cover.
- the damping plate is rigidly connected to the body by means of a cap comprising a peripheral skirt which is connected to the outside wall of the body, preferably by being screwed onto a cylindrical portion of the wall, a top which extends inwards from the skirt over the rim of the receptacle and which has a central hole through which the member for applying the variable force extends, and a part which depends from the underside of the top and carries the plate, the skirt having a series of perforations or other openings around it through which, in use, air escaping from the chamber through the pressure relief opening is exhausted.
- the flow of air escaping through the pressure relief opening, that is between the seating and the underside of the cover, is kept substantially clear of the surface of the oil or other damping liquid within the receptacle.
- the oil or other damping liquid is separated from the escaping stream of air by the wall of the recep tacle.
- the oil or other damping liquid is not contaminated by any foreign matter in the air stream and a single filling ofliquid in the receptacle can be used for a very long period compared with a single filling in the device particularly described in U.S. Pat. No. 3,108,649.
- the air inlet to the pneumatic pressure chamber extends through the wall of the chamber, and a drain opening may also be provided in the chamber wall, the drain opening being closed by a removable plug. After a period of use, the plug may be removed so that any liquid or other contaminant which has collected in the pneumatic chamber is blown out through the drain opening.
- FIG. 1 is a longitudinal section through one example, omitting the inlet-duct and throttling means, the outlet duct;
- FIG. 2 is a diagrammatic longitudinal section through the second example, omitting the inlet duct and throttling means, the outlet duct, and the member for applying the variable force to the cover.
- the device shown in FIG. 1 comprises a pneumatic pressure chamber 1 contained in a rigid cylindrical body 2.
- the chamber 1 is closed at its lower end but has an open top 3 which forms a pressure relief opening and this opening is normally closed by a loose circular cover 4.
- the cover 4 has a recess 5 in its under surface bounded by a circular ridge 6 terminating in a sharp edge which forms a seal on a flat seating surface 7 at the top end of the body 2.
- Fixed at the centre of the upper surface of the cover 4 is a bearing plate 8 containing a conical recess 9 for receiving the tip of a thrust member 10 for applying a force to the cover 4, the member 10 being shown only partially.
- the cover 4 is formed integrally with a cylindrical wall 13 projecting upwards from its periphery to form a cup 14 on the upper face of the cover 4, Le. on the face remote from the seating 7.
- An annular damping plate 15 is submerged in oil 16 contained at the bottom of the cup 14.
- the plate 15 is located co-axially with the cover 4 and the thrust member 10, and is held rigidly in position by means of a cap 17 which is rigidly connected to the outer wall of the pressure chamber body 2.
- the plate 15 is in fact formed as a radially outwardly projecting flange at the lower end of a cylindrical wall 18 which depends from the under surface of the top 19 of the cap 17.
- the top 19 extends over the rim of the cup 14 and at its periphery there is a downwardly extending cylindrical skirt 20 which is screwed at its lower end onto a wider diameter portion 21 near the upper end of the body 2.
- the top 19 of the cap 17 has a central hole 22 through which extends the thrust member 10.
- the upper region of the skirt 20, that is above the internally threaded lower region, contains a circumferentially extending series of perforations 23.
- an air inlet port 24 Opening into the side wall of the pressure chamber 1 through the body 2 is an air inlet port 24 for the connection of the air inlet duct 35 leading to the main duct 36 containing the thottle 37.
- the body 2 also contains a drain opening 25 which opens into the chamber 1 diametrically opposite the air inlet port 24.
- the drain opening 25 is normally closed by a removable plug 26.
- a screw threaded boss 27 projects from the lower end of the body 2 for mounting the device on a rigid support.
- FIG. 2 there is a cylindrical body 2A containing a pneumatic pressure chamber 1 having at its top end a pressure relief opening 3 which is normally closed by a loose circular cover 4A.
- the cover 4 has a concentric ridge 6 on its under surface bounding a recess 5 and terminating in a sharp edge which seals with a flat seating surface 7 at the top end of the body 2A.
- the cover 4 also has a bearing plate 8 fixed at the centre of its upper surface for engagement by a thrust member (not shown) for applying a force to the cover 4A.
- oil 30 is contained in an annular trough 31 which is formed integrally with the cylindrical body 2A and which extends around the bottom end of the outer wall of the body 2A.
- the cover 4A extends radially beyond the ridge 6 so that its periphery 32 is radially outwards of the outer wall of the body 2A.
- a cylindrical skirt 33 projects downwards from the periphery 32 of the cover 4A and carries at its lower end an annular damping plate 34 which is submerged in the oil 30 in the trough 31. In this way, the damping plate 34 is rigidly connected to the cover 4A.
- the upper region of the skirt 33 contains a series of perforations 35 extending around the skirt.
- a pneumatic pressure transmitting device for transmitting a pneumatic pressure which is in linear relation to-a variable applied force
- said device c0mprising a body containing a pneumatic pressure chamber, inlet duct means leading to said chamber for admitting air under a pressure greater than that to be transmitted, throttling means in said inlet duct means, outlet duct means in communication with said inlet duct means downstream of said throttling means, means defining a pneumatic pressure relief opening from said chamber, a surface defining a seating surrounding said opening, a loose cover engaging said seating to close said opening, said cover being mounted for to and fro movement toward and away from said seating and being free also for lateral rocking movement relative to said seating, and a damper for damping both said to and fro and said lateral rocking movements of said cover to prevent said cover from vibrating, whereby when air is supplied under pressure through said inlet duct means to said pneumatic pressure chamber and a variable force is applied to said cover as a thrust in a direction in alignment with the result
- a device as claimed in claim 4, wherein said means connecting said skirt to said outside wall of said body comprises cooperating screw threads on said skirt and said wall.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Motor Or Generator Frames (AREA)
- Vibration Prevention Devices (AREA)
- Fluid-Damping Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4909370 | 1970-10-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3789873A true US3789873A (en) | 1974-02-05 |
Family
ID=10451120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00187693A Expired - Lifetime US3789873A (en) | 1970-10-15 | 1971-10-08 | Pneumatic pressure transmitting device |
Country Status (11)
Country | Link |
---|---|
US (1) | US3789873A (it) |
AU (1) | AU467334B2 (it) |
BE (1) | BE774015A (it) |
CA (1) | CA935659A (it) |
CH (1) | CH551567A (it) |
DE (1) | DE2150911A1 (it) |
FR (1) | FR2110442B1 (it) |
GB (1) | GB1350918A (it) |
IT (1) | IT939556B (it) |
NL (1) | NL7114068A (it) |
SE (1) | SE373923B (it) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5092415A (en) * | 1989-04-17 | 1992-03-03 | Fumitaka Asano | Method for weighing the human body and the like |
US5224511A (en) * | 1987-04-25 | 1993-07-06 | Babcock Sempell Ag | Spring-loaded safety valve |
US5232062A (en) * | 1991-10-15 | 1993-08-03 | Tadea Limited | Viscous damping apparatus for damping load cells of weighing devices |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US957311A (en) * | 1908-11-07 | 1910-05-10 | George M Davis Regulator Company | Stop and check valve. |
FR411366A (fr) * | 1910-01-07 | 1910-06-15 | Ets De Dion Bouton | Soupape automatique avec frein réglable |
US1294002A (en) * | 1916-03-10 | 1919-02-11 | Bishop Babcock Becker Company | Valve. |
US1503357A (en) * | 1922-04-07 | 1924-07-29 | William B Ensign | Governor valve |
US2917076A (en) * | 1955-09-06 | 1959-12-15 | Abington Textile Mach Works | Surge control device and pneumatic systems containing the same |
US3086550A (en) * | 1960-10-28 | 1963-04-23 | Albert K Cummings | Slush pump valve with air cushioned valve head |
US3108649A (en) * | 1960-01-28 | 1963-10-29 | Hamilton Thomas William | Weighing machines |
US3130746A (en) * | 1962-05-15 | 1964-04-28 | Charles G Viner | Bi-directional check valves |
US3180453A (en) * | 1963-08-16 | 1965-04-27 | Kayaba Industry Co Ltd | Valve device of an oil damper for suspension of a wheel of a vehicle |
US3621713A (en) * | 1969-02-28 | 1971-11-23 | Wirth Gallo & Co | Instrument for measuring masses and forces |
-
1970
- 1970-10-15 GB GB4909370A patent/GB1350918A/en not_active Expired
-
1971
- 1971-10-08 CA CA124750A patent/CA935659A/en not_active Expired
- 1971-10-08 US US00187693A patent/US3789873A/en not_active Expired - Lifetime
- 1971-10-13 DE DE19712150911 patent/DE2150911A1/de not_active Withdrawn
- 1971-10-13 CH CH1498371A patent/CH551567A/fr not_active IP Right Cessation
- 1971-10-13 IT IT7153439A patent/IT939556B/it active
- 1971-10-13 NL NL7114068A patent/NL7114068A/xx not_active Application Discontinuation
- 1971-10-14 FR FR7136905A patent/FR2110442B1/fr not_active Expired
- 1971-10-14 SE SE7113020A patent/SE373923B/xx unknown
- 1971-10-15 BE BE774015A patent/BE774015A/xx unknown
- 1971-12-14 AU AU36868/71A patent/AU467334B2/en not_active Expired
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US957311A (en) * | 1908-11-07 | 1910-05-10 | George M Davis Regulator Company | Stop and check valve. |
FR411366A (fr) * | 1910-01-07 | 1910-06-15 | Ets De Dion Bouton | Soupape automatique avec frein réglable |
US1294002A (en) * | 1916-03-10 | 1919-02-11 | Bishop Babcock Becker Company | Valve. |
US1503357A (en) * | 1922-04-07 | 1924-07-29 | William B Ensign | Governor valve |
US2917076A (en) * | 1955-09-06 | 1959-12-15 | Abington Textile Mach Works | Surge control device and pneumatic systems containing the same |
US3108649A (en) * | 1960-01-28 | 1963-10-29 | Hamilton Thomas William | Weighing machines |
US3086550A (en) * | 1960-10-28 | 1963-04-23 | Albert K Cummings | Slush pump valve with air cushioned valve head |
US3130746A (en) * | 1962-05-15 | 1964-04-28 | Charles G Viner | Bi-directional check valves |
US3180453A (en) * | 1963-08-16 | 1965-04-27 | Kayaba Industry Co Ltd | Valve device of an oil damper for suspension of a wheel of a vehicle |
US3621713A (en) * | 1969-02-28 | 1971-11-23 | Wirth Gallo & Co | Instrument for measuring masses and forces |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5224511A (en) * | 1987-04-25 | 1993-07-06 | Babcock Sempell Ag | Spring-loaded safety valve |
US5092415A (en) * | 1989-04-17 | 1992-03-03 | Fumitaka Asano | Method for weighing the human body and the like |
US5232062A (en) * | 1991-10-15 | 1993-08-03 | Tadea Limited | Viscous damping apparatus for damping load cells of weighing devices |
Also Published As
Publication number | Publication date |
---|---|
SE373923B (it) | 1975-02-17 |
FR2110442B1 (it) | 1976-07-23 |
IT939556B (it) | 1973-02-10 |
CA935659A (en) | 1973-10-23 |
FR2110442A1 (it) | 1972-06-02 |
DE2150911A1 (de) | 1972-04-20 |
CH551567A (fr) | 1974-07-15 |
BE774015A (fr) | 1972-04-17 |
NL7114068A (it) | 1972-04-18 |
GB1350918A (en) | 1974-04-24 |
AU467334B2 (en) | 1975-11-27 |
AU3686871A (en) | 1973-06-21 |
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